abstraction
action
agent
assassin
assassinate
attack
attacker
background
battle
black
blade
camouflage
combat
criminal
cultural
danger
dark
defense
design
drawing
drawn
element
eyes
fight
fighter
figure
fist
furious
gray
grunge
guy
hit
invisibility
isolated
japan
karate
katana
killer
knife
male
mask
ninja
pose
shadow
shinobi
silhouette
stealth
sword
weapon
white